Non-Material apps

對於non-material app，你可以將center widget加到app的build() method裡面，但由於這是用non-material寫出來的，所以app bar、標題、背景要自己創建，不過這反而可以客製化更多app裡面的widget

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: const BoxDecoration(color: Colors.white),
      child: const Center(
        child: Text(
          'Hello World',
          textDirection: TextDirection.ltr,
          style: TextStyle(
            fontSize: 32,
            color: Colors.black87,
          ),
        ),
      ),
    );
  }
}

output

參考資料:
https://docs.flutter.dev/development/ui/layout